Adds a "Multi-GPU tests — use all GPUs" checkbox to the NVIDIA GPU
selector (checked by default). When enabled, PSU Pulse, NCCL, and
NVBandwidth tests run on every GPU in the system regardless of the
per-GPU selection above — which is required for correct PSU stress
testing (synchronous pulses across all GPUs create worst-case
transients). When unchecked, only the manually selected GPUs are used.
The same logic applies both to Run All (expandSATTarget) and to the
individual Run button on each multi-GPU test card.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>